Resizetizer GetMauiItems does not propagate ProjectReference AdditionalProperties #35574

Description

When a MAUI app is referenced as a library via ProjectReference with AdditionalProperties to suppress items like MauiIcon and MauiSplashScreen, Resizetizer's ResizetizeCollectItems target ignores those properties when calling GetMauiItems on the referenced project.

Steps to Reproduce

1. Have a MAUI app project that conditionally strips MauiIcon/MauiSplashScreen when a property is set:

<ItemGroup Condition="'$(IsTestLibrary)' == 'true'">
    <MauiIcon Remove="@(MauiIcon)" />
    <MauiSplashScreen Remove="@(MauiSplashScreen)" />
</ItemGroup>

2. Reference it from a test project with AdditionalProperties:

<ProjectReference Include="..\MyApp\MyApp.csproj">
    <AdditionalProperties>IsTestLibrary=true</AdditionalProperties>
</ProjectReference>

3. The test project has its own MauiIcon with a different filename.

4. Build → error: One or more duplicate file names were detected. All image output filenames must be unique: appicon

Root Cause

In Microsoft.Maui.Resizetizer.After.targets, the ResizetizeCollectItems target calls:

<MSBuild
    Targets="GetMauiItems"
    Projects="%(_ResizetizeCollectItemsProject.Identity)"
    Properties="TargetFramework=%(_ResizetizeCollectItemsProject.NearestTargetFramework)"
    ...>

It only passes TargetFramework — it does not propagate AdditionalProperties or any other metadata from the original ProjectReference item. This means the referenced project evaluates GetMauiItems without the user's properties, so the conditional Remove never fires and the app's MauiIcon/MauiSplashScreen leak into the consuming project.

Expected Behavior

ResizetizeCollectItems should propagate AdditionalProperties (and/or SetConfiguration/SetPlatform) from the ProjectReference items when invoking GetMauiItems, similar to how the standard build graph respects these properties.

Workaround

Consuming projects must add a target to strip the imported items after collection:

<Target Name="_RemoveImportedAppIcon" AfterTargets="ResizetizeCollectItems">
    <ItemGroup>
        <MauiImage Remove="@(MauiImage)"
            Condition="'\%(MauiImage.Filename)' == 'appicon' and '\%(MauiImage.IsAppIcon)' == 'True'" />
    </ItemGroup>
</Target>

Context

This pattern is increasingly common for device testing scenarios where a test app references the real app as a library to test controls/ViewModels with real styles and resources. Both mattleibow/DeviceRunners and pictos/DeviceAppTest independently hit this and implemented the same workaround.

Suggested Fix

In ResizetizeCollectItems, when building the _ResizetizeCollectItemsProject items, carry over the AdditionalProperties metadata from the original ProjectReference items and append them to the Properties parameter of the MSBuild task call.